Um esquema geral para a discussão do movimento de materiais para as células vivas e tecidos

Broyer, T. C.; Malavolta, E.

doi:10.1590/S0071-12761953000100013

Resumo

A generalized comprehensive scheme concerning the movement of materials into living cells and tissues is presented. It is designed for use by investigators and teachers who, is assumed, have a previous knowledge of the subject as well as familiarity with previously published literature on the subject. Footnotes to figure 2 X = a constituent component material, arising from extermal sources or through metabolism, capable of migration under favorable conditions. e, i, ec, ic, mc = subscripts indicating location. oC = oxidized cytoplasmic constituents specifically concerned in unidirectional (here invardly directed), diffetial translocation of a particular material X. rC = reduced cytoplasmic constituents specifically concerned. XF = specific free energy (2) of a constituent component in in external or internal phases or in cytoplasm. D = diffusion (4). EA = exchange adsorption (4). MA= metabolic accumulation (4), CI = differentially characteristic cytoplasmic interaction (4) between oC and X, determined by the genetic constitution of the biological species. ▬▬▬>= migration, where permeability to the material involved is relatively high; and ~~~~->, where relatively low. <▬▬▬>= chemical reactions. ▬▬▬>= energy changes of X; diffusion is characteristically with the direction in which the concentration or activity of the constituent decreases, exchange adsorption may be with or against the direction of concentration or activity decrease.

^IDepartment of Plant Nutrition, University of California, Berkeley, Calif., U. S. A

^IISecção Técnica de Química Agrícola, E. S. A. "Luiz de Queiroz", Universidade de São Paulo

SUMMARY

A generalized comprehensive scheme concerning the movement of materials into living cells and tissues is presented. It is designed for use by investigators and teachers who, is assumed, have a previous knowledge of the subject as well as familiarity with previously published literature on the subject.

Footnotes to figure 2

X = a constituent component material, arising from extermal sources or through metabolism, capable of migration under favorable conditions.

e, i, ec, ic, mc = subscripts indicating location.

oC = oxidized cytoplasmic constituents specifically concerned in unidirectional (here invardly directed), diffetial translocation of a particular material X.

rC = reduced cytoplasmic constituents specifically concerned.

XF = specific free energy (2) of a constituent component in in external or internal phases or in cytoplasm.

D = diffusion (4).

EA = exchange adsorption (4).

MA= metabolic accumulation (4),

CI = differentially characteristic cytoplasmic interaction (4) between oC and X, determined by the genetic constitution of the biological species.

▬▬▬>= migration, where permeability to the material involved is relatively high; and ~~~~->, where relatively low.

<▬▬▬>= chemical reactions.

▬▬▬>= energy changes of X; diffusion is characteristically with the direction in which the concentration or activity of the constituent decreases, exchange adsorption may be with or against the direction of concentration or activity decrease.

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